Which subdivision of the autonomic nervous system prepares the body for flight or fight?

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The sympathetic division of the autonomic nervous system is what fuels a rapid, energizing response to danger. When activated, it increases heart rate and blood flow to muscles, opens airways, dilates pupils, releases stored energy, and slows less essential processes like digestion. This combination readies the body for quick action—classic fight or flight.

The parasympathetic division, by contrast, promotes rest and digestion and helps conserve energy, which is the opposite of the aroused state needed for fighting or fleeing. The autonomic nervous system is the broader system that includes both sympathetic and parasympathetic branches, not a specific response itself. The central nervous system refers to the brain and spinal cord, and it doesn’t describe a subdivision responsible for these reflexive bodily preparations.

So the subdivision that best fits “prepares the body for flight or fight” is the sympathetic nervous system.